How much does it cost to fix boiler error code 98?

Typical repair cost for the boiler 98 fault is £120-280 including labour.

98 High

Boiler Fault Code 98

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 31 August 2026

Fault code 98 appears across 3 boiler brands and 7 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's internal computer is having trouble communicating with an add-on control component, which usually means the system cannot manage your heating or hot water correctly. (As reported on ECA FELiS FL 50 HM)

Pick your boiler brand for the 98 fix

Alpha 98 5 models ECA 98 1 model Navien 98 1 model

Source

Information for the 98 fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026